[tor-bugs] #29064 [Core Tor/Tor]: shellcheck: test_rust.sh issues

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#29064: shellcheck: test_rust.sh issues
------------------------------+----------------------------
     Reporter:  rl1987        |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  technical-debt
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+----------------------------
 {{{

 In test_rust.sh line 19:
             "${CARGO:-cargo}" test ${CARGO_ONLINE-"--frozen"} \
                                    ^-- SC2086: Double quote to prevent
 globbing and word splitting.


 In test_rust.sh line 21:
             --target $rustc_host \
                      ^-- SC2086: Double quote to prevent globbing and word
 splitting.


 In test_rust.sh line 22:
             ${EXTRA_CARGO_OPTIONS} \
             ^-- SC2086: Double quote to prevent globbing and word
 splitting.

 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29064>
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